2
When a verb or impersonal expression that expresses emotion appears in the main clause of a complex sentence, the verb in the subordinate clause is in the subjunctive. Temo que la clase sea difícil. I’m afraid that the class might be hard. ↑ ↑ main clause subordínate clause

3
If there is no change of subject in the sentence, use the infinitive. Temo tomar la clase. I’m afraid to take the class. Nos alegramos de reciclar las latas y botellas. We’re happy to recycle cans and bottles.

4
The verbs gustar, molestar and sorprender are used with indirect object pronouns (me, te, le, nos, os, les). Me gusta que no contamines el medio ambiente. I like that you don’t pollute the environment. Les sorprende que reciclemos los envases de plástico. It surprises them that we recycle plastic containers.

5
Ojalá (que) I hope (that), I wish (that) is of Arabic origin. (Alá = God) It originally meant May God grant… Ojalá que protejamos el planeta. I hope that we protect the planet.